Air conditioning system

Abstract

The utility model provides an air-conditioning system, which comprises an outdoor module provided with a plurality of compressors, a switching valve, an oil separator, a gas-liquid separator, a distribution pipeline, a distributor, a diversion pipeline and an oil return pipeline; wherein the oil separators, the gas-liquid separators and the compressors are arranged in a one-to-one correspondence manner, and each oil separator is connected with the discharge end of one compressor; the gas-liquid separators are respectively connected with the suction end of one compressor, and a gas equalizing pipe and a liquid equalizing pipe are arranged between the gas-liquid separators; the inlet end of the distribution pipeline is connected with a switching valve; the distributor inlet end is connected with the outlet end of the distribution pipeline; the flow guide pipelines and the gas-liquid separators are arranged in a one-to-one correspondence manner and are respectively connected with one outlet end of the distributor, and the flow guide pipelines extend into the gas-liquid separators; the oil return pipelines correspond to the oil separators one to one, the inlet ends of the oil return pipelines are connected with the oil separators, and the outlet ends of the oil return pipelines are arranged between one outlet end of the distributor and the corresponding flow guide pipeline in a staggered mode. The problem of oil shortage can be avoided, and the system reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] Multi-split air conditioning systems have gradually adopted modular outdoor unit designs to meet the needs of medium and large commercial air conditioning systems, such as office buildings, shopping malls, and hotels. This multi-split air conditioning system can provide higher cooling capacity and higher reliability, and is also often used in data centers and other environments that require precise control of temperature and humidity. Each outdoor module is equipped with its own compressor and heat exchanger. The outdoor modules can be combined as needed to meet different cooling needs. Each outdoor module operates independently. When the cooling capacity needs to be increased, only more modules need to be added without replacing the entire system. If one of the outdoor modules fails, the other outdoor modules can still continue to operate.

[0003] Although it has advantages in flexibility and reliability, the design, installation and maintenance of modular outdoor units are more complicated than ordinary air-conditioning systems, especially since the combined capacity can reach 168HP, which makes it difficult for traditional container components to match it. For example, the upper limit of the volume of small pressure vessels used in air-conditioning systems, such as gas-liquid separators, is less than 30L, and cannot even meet the use requirements of a single outdoor module. In the prior art, two parallel gas-liquid separators are usually set in one outdoor unit module. The refrigerant is carried by two gas-liquid separators at the same time, and a liquid equalizing pipe and a gas equalizing pipe are designed at the top and bottom of each to balance the internal pressure of the parallel gas-liquid separators so that the liquid level tends to be consistent.

[0004] Due to the complex operating conditions of the multi-split air conditioning system, especially when multiple compressors are used, there will be a natural pressure difference inside the two gas-liquid separators. In the prior art, this problem is usually solved by using a very large diameter of the gas equalizing pipe, which makes the pressure deviation of the two gas-liquid separators as small as possible. However, the difference in the liquid level of the oil-liquid mixture inside the two cannot be avoided. Long-term use will affect the amount of lubricating oil in the compressor connected to it, and even cause the compressor to be damaged due to lack of oil. Summary of the invention

[0005] The utility model provides an air-conditioning system. In one or more embodiments of the present application, the air-conditioning system includes an outdoor module, which has a plurality of compressors, a switching valve, an oil separator and a gas-liquid separator; wherein the oil separators are arranged in a one-to-one correspondence with the compressors, and each oil separator is respectively connected to the discharge end of a compressor; the gas-liquid separators are arranged in a one-to-one correspondence with the compressors, and the gas-liquid separators are respectively connected to the suction end of a compressor, and an air equalizing pipe and a liquid equalizing pipe are arranged between the gas-liquid separators.

[0006] In one or more embodiments of the present application, the outdoor module also has a distribution pipeline, a distributor and a diversion pipeline; the inlet end of the distribution pipeline is connected to the switching valve; the inlet end of the distributor is connected to the outlet end of the distribution pipeline; the diversion pipeline is arranged in a one-to-one correspondence with the gas-liquid separator and is respectively connected to one outlet end of the distributor, and the diversion pipeline extends into the gas-liquid separator; the return oil pipeline is arranged in a one-to-one correspondence with the oil separator, its inlet end is connected to the oil separator, and the outlet end is staggered between one outlet end of the distributor and the corresponding diversion pipeline.

[0007] In one or more embodiments of the present application, the outdoor module also has a return pipeline, and the return pipeline is arranged in a one-to-one correspondence with the gas-liquid separator; the return pipeline has a connecting pipe section, a connecting pipe section and a bent pipe section, the connecting pipe section is vertically arranged in the gas-liquid separator, the connecting pipe section is connected to the suction end of a compressor, the connecting pipe section is vertically arranged in the gas-liquid separator, the bent pipe section connects the bottom of the connecting pipe section and the connecting pipe section, and the sum of the heights of the connecting pipe section and the bent pipe section is less than the height of the gas-liquid separator.

[0008] In one or more embodiments of the present application, a bottom connecting port is provided at the bottom of the curved pipe section, and the bottom connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator.

[0009] In one or more embodiments of the present application, the outdoor module further comprises: a regulating pipeline, the inlet end of which is connected to a plurality of oil separators, and the outlet end of which is connected to the distribution pipeline; and a regulating capillary and a regulating solenoid valve are arranged on the regulating pipeline.

[0010] In one or more embodiments of the present application, an oil return capillary tube and a filter are provided on the oil return branch line.

[0011] In one or more embodiments of the present application, the air conditioning system includes a plurality of outdoor modules and indoor modules, each outdoor module has a plurality of compressors, a switching valve, an oil separator and a gas-liquid separator; the oil separators are arranged in a one-to-one correspondence with the compressors, each oil separator is connected to the discharge end of a compressor, the gas-liquid separators are arranged in a one-to-one correspondence with the compressors, the gas-liquid separators are connected to the suction end of a compressor, and an air-equalizing pipe and a liquid-equalizing pipe are arranged between the gas-liquid separators; the indoor module has: indoor liquid-side piping and indoor gas-side piping; the outdoor module also has outdoor liquid-side piping, Outdoor gas side piping, distribution pipeline, distributor, guide pipeline and return oil pipeline, multiple outdoor liquid side piping is connected to indoor liquid side piping, multiple outdoor gas side piping is connected to indoor gas side piping, the inlet end of the distribution pipeline is connected to the switching valve, the inlet end of the distributor is connected to the outlet end of the distribution pipeline, the guide pipeline is arranged in a one-to-one correspondence with the gas-liquid separator and is respectively connected to one outlet end of the distributor, the guide pipeline extends into the gas-liquid separator, the return oil pipeline is arranged in a one-to-one correspondence with the oil separator, its inlet end is connected to the oil separator, and the outlet end is staggered between one outlet end of the distributor and the corresponding guide pipeline.

[0012] In one or more embodiments of the present application, the outdoor module further comprises: a return pipeline, which is arranged in one-to-one correspondence with the gas-liquid separator, the return pipeline comprises a connecting pipe section, a connecting pipe section and a bent pipe section, the connecting pipe section is vertically arranged in the gas-liquid separator, the connecting pipe section is connected to the suction end of a compressor, the connecting pipe section is vertically arranged in the gas-liquid separator, the bent pipe section connects the bottom of the connecting pipe section and the connecting pipe section, and the sum of the heights of the connecting pipe section and the bent pipe section is less than the height of the gas-liquid separator.

[0013] In one or more embodiments of the present application, a connecting port is provided at the bottom of the curved pipe section, and the connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator.

[0014] In one or more embodiments of the present application, a bottom connecting port is opened at the bottom of the bent pipe section, and the bottom connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator; an upper connecting port is opened on the connecting pipe section, and the upper connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator.

[0015] In one or more embodiments of the present application, the liquid equalizing pipe is located above the upper connecting port.

[0016] The present application enables gas-liquid balance and distribution between the gas-liquid separators, further ensures the balance of the liquid level, and further enables each compressor to obtain the same liquid level supply, avoiding the problem of oil shortage, and improving the operating efficiency and reliability of the air-conditioning system.

[0017] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0020] Figure 2 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0021] Figure 3 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0022] Figure 4 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0023] Figure 5 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0024] Figure 6 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0025] Figure 7 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0026] Figure 8 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0027] Fig. 9 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0028] Fig.10 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0029] Fig.11 is a schematic diagram of the structure of an air conditioning system provided by one or more embodiments of the present application;

[0030] Reference numerals:

[0031] 10. Outdoor module; 11. First outdoor module; 12. Second outdoor module; 20. Indoor module; 30. Liquid pipe; 40. Gas pipe; 31. First outdoor liquid side piping; 41. First outdoor gas side piping; 32. Second outdoor liquid side piping; 42. Second outdoor gas side piping; 50. Indoor liquid side piping; 60. Indoor gas side piping;

[0032] 101-1, first compressor; 101-2, second compressor; 102-1, first exhaust temperature sensor; 102-2, second exhaust temperature sensor; 103-1, first high pressure switch; 103-2, second high pressure switch; 104-1, first oil separator; 104-2, second oil separator; 105, exhaust pressure sensor; 106, switching valve; 107, outdoor heat exchanger; 108, outdoor throttling element; 109, liquid pipe stop valve; 110, gas pipe stop valve; 111, distribution pipeline; 112-1, first guide pipeline; 112-2, second guide pipeline; 113, distributor; 114-1, first gas-liquid separator; 114-2, second gas-liquid separator; 115-1, first return pipeline; 115-2, second return pipeline; 116, uniform gas Tube; 117, liquid balancing tube; 118-1, first bottom connecting port; 118-2, second bottom connecting port; 119, first connecting pipeline; 120, second connecting pipeline; 121, first oil return pipeline; 122, second oil return pipeline; 123, first oil return capillary; 124, second oil return capillary; 125, first filter; 126, second filter; 127, suction end pressure sensor; 128, regulating pipeline; 129, regulating solenoid valve; 130, regulating capillary; 131-1, first upper connecting port; 131-2, second upper connecting port; 132-1, first connecting pipe section; 132-2, second connecting pipe section; 133-1, first elbow section; 133-2, second elbow section; 134-1, first connecting pipe section; 134-2, second connecting pipe section;

[0033] 201. Indoor heat exchanger; 202. Indoor throttling element. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and settings discussed in itself. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and the use of other materials.

[0040] Hereinafter, one or more embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] The present application relates to an air conditioning system, and more particularly to a multi-split air conditioning system. A multi-split air conditioning system is an air conditioning system that can independently cool and heat multiple rooms or areas, and the temperature of each room or area can be controlled independently or in combination. The multi-split air conditioning system is particularly suitable for buildings that require independent temperature control and include multiple rooms or areas, such as office buildings, schools, hotels, and large residences.

[0042] A refrigeration cycle is integrated into the VRF system. A compressor, condenser, throttling device and evaporator are used in the refrigeration cycle. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation to cool or heat the indoor space.

[0043] From the perspective of principle, low-temperature and low-pressure refrigerant enters the compressor, which compresses it into high-temperature and high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser, which condenses the compressed refrigerant into liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0044] The throttling device expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the throttling device and returns the refrigerant in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioning system can adjust the temperature of the indoor space.

[0045] like Figure 1 As shown, in one or more embodiments of the present application, the air conditioning system includes an outdoor module 10 and an indoor module 20 connected to each other.

[0046] The outdoor module 10 and the indoor module 20 are connected via a liquid pipe 30 and a gas pipe 40. The liquid pipe 30 and the gas pipe 40 are used to allow the refrigerant to flow, so that the refrigerant can form a refrigerant circuit and circulate therein.

[0047] In one or more embodiments of the present application, a liquid pipe shut-off valve 109 is provided on the liquid pipe 30 .

[0048] In one or more embodiments of the present application, an air pipe shut-off valve 110 is provided on the air pipe 40 .

[0049] The outdoor module 10 is introduced below. Figure 1 and Figure 4 shown.

[0050] In one or more embodiments of the present application, the outdoor module 10 is a part of the refrigeration cycle including a compressor and an outdoor heat exchanger 107. The outdoor module 10 can perform heating operation or cooling operation on the outdoor side to provide energy for increasing the indoor temperature or reducing the indoor temperature to the indoor module 20. The outdoor heat exchanger 107 is correspondingly provided with an outdoor throttling element 108.

[0051] In one or more embodiments of the present application, the outdoor module 10 includes a plurality of compressors, such as Figure 1 The first compressor 101-1 and the second compressor 101-2 are shown. The first compressor 101-1 and the second compressor 101-2 are the same compressors.

[0052] The discharge end of the first compressor 101-1 is provided with a first high-pressure switch 103-1, and the discharge end of the second compressor 101-2 is provided with a second high-pressure switch 103-2. The first high-pressure switch 103-1 and the second high-pressure switch 103-2 are used to monitor the pressure in the system. When the pressure in the air-conditioning system exceeds the set safety threshold, the first high-pressure switch 103-1 and / or the second high-pressure switch 103-2 will automatically cut off the power supply and stop the operation of the first compressor 101-1 and / or the second compressor 101-2 to protect the equipment and devices in the air-conditioning system from damage caused by the high pressure. The safety threshold of the first high-pressure switch 103-1 and / or the second high-pressure switch 103-2 can be set according to the design parameters and working conditions of the air-conditioning system. Once the pressure in the system is reduced to a safe level, the first high-pressure switch 103-1 and / or the second high-pressure switch 103-2 will restore the power supply to restart the first compressor 101-1 and / or the second compressor 101-2.

[0053] A first exhaust gas temperature sensor 102 - 1 is provided at the discharge end of the first compressor 101 - 1 , and a second exhaust gas temperature sensor 102 - 2 is provided at the discharge end of the second compressor 101 - 2 .

[0054] In one or more embodiments of the present application, an oil separator is also provided in the outdoor module 10. The oil separators are provided one by one with the compressors, and each oil separator is connected to the discharge end of a compressor. Figure 1 As shown, a first oil separator 104-1 and a second oil separator 104-2 are provided, the first oil separator 104-1 is provided at the discharge end of the first compressor 101-1, and the second oil separator 104-2 is provided at the discharge end of the second compressor 101-2. The first oil separator 104-1 and the second oil separator 104-2 are used in the air conditioning system to separate the lubricating oil and the refrigerant. Since the first compressor 101-1 and the second compressor 101-2 need lubricating oil to reduce friction and wear to ensure normal operation, the lubricating oil will be mixed with the refrigerant when the first compressor 101-1 and the second compressor 101-2 are working. The first oil separator 104-1 and the second oil separator 104-2 separate the lubricating oil from the refrigerant through the principle of physical separation (such as centrifugal force or gravity), and the separated lubricating oil is recovered and recycled, while the refrigerant continues to flow. The first oil separator 104-1 and the second oil separator 104-2 are equipped with a one-way valve (not shown).

[0055] In one or more embodiments of the present application, a gas-liquid separator is further provided in the outdoor module 10. The gas-liquid separators are provided in a one-to-one correspondence with the compressors, and the gas-liquid separators are respectively connected to the suction end of a compressor. Exemplarily, the first gas-liquid separator 114-1 is connected to the suction end of the second compressor 101-2 via a first connecting pipe 119, and the second gas-liquid separator 114-2 is connected to the suction end of the first compressor 101-1 via a second connecting pipe 120. An air equalizing pipe 116 and a liquid equalizing pipe 117 are provided between the gas-liquid separators. Exemplarily, as Figure 1 As shown, the outdoor module 10 is provided with a first gas-liquid separator 114-1 and a second gas-liquid separator 114-2, and the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 are exactly the same. The first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 are separated based on the density difference between gas and liquid. When the refrigerant containing mixed gas and liquid enters the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2, due to the action of gravity, the liquid refrigerant with a larger density will sink, and the gas with a lighter density will rise. In this way, the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 can effectively separate the liquid and gaseous refrigerants. The first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 can store excess refrigerant at the same time. The first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 are connected to each other through the gas equalizing pipe 116 on the upper side and the liquid equalizing pipe 117 on the lower side.

[0056] In one or more embodiments of the present application, a switching valve 106 is further provided in the outdoor module 10. The switching valve 106 is usually a four-way valve, which allows the air conditioning system to switch between the cooling mode and the heating mode. When the air conditioning system works in the cooling mode, the outdoor heat exchanger 107 is used as a condenser, and when the air conditioning system works in the heating mode, the outdoor heat exchanger 107 is used as an evaporator.

[0057] In one or more embodiments of the present application, an outdoor fan (not shown) is further provided in the outdoor module 10, and the rotation speed of the outdoor fan can be controlled to change the flow rate of air heat exchanged with the outdoor heat exchanger 107 by adjusting the rotation speed. The outdoor fan can be an axial flow fan, a cross flow fan or other optional fan forms. The outdoor fan is arranged near the outdoor heat exchanger 107.

[0058] In one or more embodiments of the present application, an exhaust pressure sensor 105 is disposed downstream of the first oil separator 104 - 1 and the second oil separator 104 - 2 .

[0059] In cooling operation, the outdoor module 10 can form a refrigerant circuit for cooling operation, which is connected in sequence from the gas pipe 40 to the liquid pipe 30 with the switching valve 106 (for example, the passage between the C port and the S port of the four-way valve), the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 in parallel, the first compressor 101-1 and the second compressor 101-2 in parallel, the switching valve 106 (for example, the passage between the D port and the E port of the four-way valve), the outdoor heat exchanger 107 and the outdoor electronic expansion valve, as shown in FIG. Figure 2 shown.

[0060] Under heating operation, the outdoor unit can form a refrigerant circuit for heating operation, which is connected in sequence from the liquid side piping to the gas side piping, with an outdoor electronic expansion valve, an outdoor heat exchanger 107, a switching valve 106 (for example, the passage between the E port and the S port of the four-way valve), a first gas-liquid separator 114-1 and a second gas-liquid separator 114-2 in parallel, a first compressor 101-1 and a second compressor 101-2 in parallel and a switching valve 106 (for example, the passage between the D port and the C port of the four-way valve).

[0061] The structure and function of the indoor module 20 are described below. Figure 1 and Figure 5 shown.

[0062] The indoor module 20 performs a cooling operation or a heating operation using the energy for increasing the indoor temperature or the energy for decreasing the indoor temperature generated by the outdoor unit.

[0063] In one or more embodiments of the present application, the indoor module 20 includes a plurality of indoor heat exchangers 201 connected in parallel, each of which is matched with an indoor throttling element 202, and the indoor throttling element 202 is configured to reduce the pressure of the refrigerant and expand it. A group of indoor heat exchangers 201 and indoor throttling elements 202 can be set in an air-conditioned room and matched with an indoor fan, which can be an axial fan, a cross-flow fan or other forms of fans. The indoor fan is set close to the indoor heat exchanger 201.

[0064] In one or more embodiments of the present application, the outdoor module 10 also includes a distribution pipeline 111, a distributor 113, a guide pipeline and an oil return pipeline. Among them, the inlet end of the distribution pipeline 111 is connected to the switching valve 106. A guide pipeline is provided downstream of the distributor 113, and the inlet end of the distributor 113 is connected to the outlet end of the distribution pipeline 111. The guide pipeline is arranged in a one-to-one correspondence with the gas-liquid separator and is respectively connected to one outlet end of the distributor 113, and the guide pipeline extends into the gas-liquid separator. The oil return pipeline is arranged in a one-to-one correspondence with the oil separator, the inlet end of the return oil pipeline is connected to the oil separator, and the outlet end is staggered between one outlet end of the distributor 113 and the corresponding guide pipeline. That is, the oil return pipeline and the gas-liquid separator are complementary in design. A suction end pressure sensor 127 is provided on the distribution pipeline 111.

[0065] like Figure 1 and Figure 5 As shown, in one or more embodiments of the present application, the outdoor module 10 is provided with a first flow guiding pipeline 112-1 and a second flow guiding pipeline 112-2, the first flow guiding pipeline 112-1 is provided corresponding to the first gas-liquid separator 114-1, the first flow guiding pipeline 112-1 is connected to one outlet end of the distributor 113, and the first flow guiding pipeline 112-1 extends into the first gas-liquid separator 114-1. The second flow guiding pipeline 112-2 is provided corresponding to the second gas-liquid separator 114-2, the second flow guiding pipeline 112-2 is connected to another outlet end of the distributor 113, and the second flow guiding pipeline 112-2 extends into the second gas-liquid separator 114-2, and the outlet ends of the first flow guiding pipeline 112-1 and the second flow guiding pipeline 112-2 remain suspended and do not contact other pipelines or inner walls.

[0066] In one or more embodiments of the present application, the distributor 113 is a three-way pipe, and the pipe length and pipe diameter of the two outlet ends of the three-way pipe are the same.

[0067] In one or more embodiments of the present application, the distributor 113 may also be other pipeline connectors.

[0068] In one or more embodiments of the present application, the first oil return pipeline 121 is arranged corresponding to the second oil separator 104-2, the inlet end of the first oil return pipeline 121 is connected to the second oil separator 104-2, and the outlet end of the first oil return pipeline 121 is arranged between the outlet end of the distributor 113 corresponding to the second gas-liquid separator 114-2 and the second guide pipeline 112-2; the second oil return pipeline 122 is arranged corresponding to the first oil separator 104-1, the inlet end of the second oil return pipeline 122 is connected to the first oil separator 104-1, and the outlet end of the second oil return pipeline 122 is arranged between the outlet end of the distributor 113 corresponding to the first gas-liquid separator 114-1 and the first guide pipeline 112-1.

[0069] The first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 are used to equalize gas through the gas equalizing pipe 116 on the upper side, and to equalize oil and liquid through the liquid equalizing pipe 117 on the lower side; the distributor 113 is used as the first-layer distribution device to realize the distribution of the refrigerant; although the outlet end of the distributor 113 is the same, the direction and length of the system pipeline layout cannot be completely consistent, and the working conditions of the first compressor 101-1 and the second compressor 101-2 themselves (such as the suction volume) cannot be completely consistent, so the refrigerant distributed by the distributor 113 may be different; only by distributing through the distributor 113, it is impossible to avoid the pressure difference between the two gas-liquid separators (more than 1KPa under certain working conditions). Due to the existence of the liquid equalizing pipe 117, the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 will gradually reach a dynamic equilibrium state, and there may be a liquid level difference in the dynamic equilibrium state. Although the lubricating oil and the liquid refrigerant can be completely miscible in a static state, in a flowing state, the liquid mixture that has just entered the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 has a high content of liquid refrigerant, and the liquid refrigerant will gather at the upper part of the liquid mixture and penetrate downward over time. If there is a pressure difference, the liquid level in the gas-liquid separator with a higher pressure will be lower, and the liquid mixture with the highest lubricating oil concentration at the bottom of this side will continuously flow into the gas-liquid separator with a higher pressure through the liquid equalizing pipe 117, while the upper liquid mixture in the gas-liquid separator with a lower pressure will continuously enter, storing more and more liquid refrigerant, causing the lubricating oil in the gas-liquid separator with a higher pressure to be continuously diluted, and ultimately making it impossible for the lubricating oil in the compressor oil pool connected to it to be effectively replenished.

[0070] On the basis of the distribution of the first-layer distributor 113, the utility model also designs a first guide pipeline 112-1 and a second guide pipeline 112-2 to realize the second-layer distribution. Continuing with the above description, the lubricating oil concentration in the gas-liquid separator with higher pressure becomes lower and the lubricating oil concentration in the gas-liquid separator with lower pressure becomes higher, then the oil volume in the oil pool of the compressor connected to the gas-liquid separator with higher pressure is lower, and the oil volume in the oil pool of the compressor connected to the gas-liquid separator with lower pressure is higher. When the lubricating oil in the oil pool of the compressor with higher oil volume rises to a certain height, a large amount of oil will be discharged to the oil separator at the discharge end, and the oil separator will return to the other outlet end of the distributor 113 and the corresponding guide pipeline through the corresponding oil return pipeline, so as to make up for the concentration of the lubricating oil in the gas-liquid separator with lower oil volume, and further improve the oil volume in the oil pool at the bottom of the compressor connected thereto.

[0071] like Figure 7 As shown, assuming that the pressure of the first gas-liquid separator 114-1 (as shown by the arrow P1 in the figure) is higher than the pressure of the second gas-liquid separator 114-2 (as shown by the arrow P2 in the figure), for example, the pressure of the first gas-liquid separator 114-1 is 1 KPa higher than the pressure of the second gas-liquid separator 114-2, then the liquid level of the first gas-liquid separator 114-1 will be 10 cm lower than the liquid level of the second gas-liquid separator 114-2, and the liquid mixture with the best lubricating oil concentration at the bottom of the first gas-liquid separator 114-1 will be The oil is continuously introduced into the second gas-liquid separator 114-2, the lubricating oil concentration at the bottom of the first gas-liquid separator 114-1 becomes lower (as shown by the arrow C1 in the figure), while the lubricating oil concentration at the bottom of the second gas-liquid separator 114-2 becomes higher (as shown by the arrow C2 in the figure); further, the oil volume at the bottom of the oil pool of the second compressor 101-2 connected to the first gas-liquid separator 114-1 decreases (as shown by the arrow Q2 in the figure), and the oil volume at the bottom of the oil pool of the first compressor 101-1 increases (as shown by the arrow Q1 in the figure). When the oil volume in the oil pool of the first compressor 101-1 increases to a certain height, a large amount of lubricating oil will be discharged to the first oil separator 104-1 through the exhaust pipe. The outlet of the second oil return pipeline 122 corresponding to the first oil separator 104-1 is arranged between the distributor 113 and the outlet end corresponding to the first gas-liquid separator 114-1 and the first flow guiding pipeline 112-1, close to the first flow guiding pipeline 112-1, that is, the lubricating oil concentration in the first gas-liquid separator 114-1 can be more supplemented, so that the lubricating oil amount in the second compressor 101-2 connected to the first gas-liquid separator 114-1 is improved, and secondary distribution is realized. Vice versa, similar processes are not repeated.

[0072] In one or more embodiments of the present application, the outdoor module 10 further has a return pipeline, and the return pipeline is arranged in a one-to-one correspondence with the gas-liquid separator. The return pipeline has a connecting pipe section, a connecting pipe section and a curved pipe section, the connecting pipe section is vertically arranged in the gas-liquid separator, and the connecting pipe section is connected to the suction end of a compressor; the connecting pipe section is vertically arranged in the gas-liquid separator, the connecting pipe section is connected to the suction end of a compressor, the curved pipe section connects the bottom of the connecting pipe section and the connecting pipe section, and the sum of the heights of the connecting pipe section and the curved pipe section is less than the height of the gas-liquid separator.

[0073] In one or more embodiments of the present application, Figure 1 , Figure 5 and Figure 6 As shown, the outdoor module 10 also has a first return pipeline 115-1 and a second return pipeline 115-2. The first return pipeline 115-1 is arranged corresponding to the first gas-liquid separator 114-1, and the second return pipeline 115-2 is arranged corresponding to the second gas-liquid separator 114-2.

[0074] In one or more embodiments of the present application, the first return pipe 115-1 includes a first connecting pipe section, a first communicating pipe section 132-1 and a first elbow pipe section 133-1, the first connecting pipe section 134-1 is vertically arranged in the first gas-liquid separator 114-1, and the first connecting pipe section 134-1 is connected to the suction end of the second compressor 101-2 through the first communicating pipe 119. The first communicating pipe section 132-1 is vertically arranged in the gas-liquid separator, the first elbow pipe section 133-1 connects the first connecting pipe section 134-1 and the bottom of the first communicating pipe section 132-1, and the sum of the heights of the first communicating pipe section 132-1 and the first elbow pipe section 133-1 is less than the height of the first gas-liquid separator 114-1.

[0075] In one or more embodiments of the present application, the second return pipe 115-2 has a second connecting pipe section 134-2, a second connecting pipe section 132-2 and a second bend pipe section 133-2, the second connecting pipe section 134-2 is vertically arranged in the second gas-liquid separator 114-2, and the second connecting pipe section 134-2 is connected to the suction end of the first compressor 101-1 through the second connecting pipe 120; the second connecting pipe section 132-2 is vertically arranged in the gas-liquid separator, the second bend pipe section 133-2 connects the second connecting pipe section 134-2 and the bottom of the second connecting pipe section 132-2, and the sum of the heights of the second connecting pipe section 132-2 and the second bend pipe section 133-2 is less than the height of the second gas-liquid separator 114-2.

[0076] In one or more embodiments of the present application, a bottom connecting port is provided at the bottom of the curved pipe section, and the bottom connecting port connects the reflux pipeline and the inner cavity of the gas-liquid separator. The connecting port plays the role of oil return.

[0077] In one or more embodiments of the present application, a bottom connecting port is opened at the bottom of the curved pipe section, and the bottom connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator; a plurality of upper connecting ports are opened on the connecting pipe section, and the upper connecting ports connect the reflux pipeline and the internal cavity of the gas-liquid separator.

[0078] In one or more embodiments of the present application, a first bottom connecting port 118-1 is provided at the bottom of the first curved pipe section 133-1, and the first bottom connecting port 118-1 connects the first return pipeline 115-1 and the internal cavity of the first gas-liquid separator 114-1; a plurality of first upper connecting ports 131-1 are provided on the first connecting pipe section, and the first upper connecting ports 131-1 connect the return pipeline and the internal cavity of the gas-liquid separator.

[0079] In one or more embodiments of the present application, a second bottom connecting port 118-2 is provided at the bottom of the second curved pipe section 133-2, and the second bottom connecting port 118-2 connects the second return pipeline 115-2 and the internal cavity of the second gas-liquid separator 114-2; a plurality of second upper connecting ports 131-2 are provided on the second connecting pipe section, and the second upper connecting ports 131-2 connect the return pipeline and the internal cavity of the gas-liquid separator.

[0080] In one or more embodiments of the present application, the outdoor module 10 further has a regulating pipeline 128. The inlet end of the regulating pipeline 128 is connected to the outlet ends of several oil separators, and the outlet end of the regulating pipeline 128 is connected to the distribution pipeline 111. The regulating pipeline 128 is provided with a regulating capillary 130 and a regulating solenoid valve 129.

[0081] In one or more embodiments of the present application, a first oil return capillary tube 123 and a first filter 125 are provided on the first oil return branch line.

[0082] In one or more embodiments of the present application, a second oil return capillary tube 124 and a second filter 126 are provided on the second oil return branch line.

[0083] like Figures 8 to 10 As shown, the air conditioning system includes a plurality of outdoor modules, such as a first outdoor module 11 and a second outdoor module 12 as shown in the figure. Each outdoor module has a plurality of compressors, a switching valve, a plurality of oil separators corresponding to the compressors, and a gas-liquid separator corresponding to the compressors; wherein each oil separator is connected to the discharge end of a compressor, and the gas-liquid separator is staggeredly connected to the suction end of a compressor, and an air equalization pipe and a liquid equalization pipe are arranged between the gas-liquid separators.

[0084] The indoor module includes an indoor liquid-side pipe 50 and an indoor gas-side pipe 60 .

[0085] The outdoor module further comprises outdoor liquid side piping and outdoor gas side piping. The multiple outdoor liquid side piping is connected to the indoor liquid side piping, and the multiple outdoor gas side piping is connected to the indoor gas side piping.

[0086] like Figure 8 As shown, the first outdoor module 11 has a first outdoor liquid side piping 31 and a first outdoor gas side piping 41; the second outdoor module 12 has a second outdoor liquid side piping 32 and a second outdoor gas side piping 42; the first outdoor liquid side piping 31 and the second outdoor liquid side piping 32 are connected to the indoor liquid side piping 50, and the second outdoor gas side piping 41 and the second outdoor gas side piping 42 are connected to the indoor gas side piping 60.

[0087] The outdoor module also has a distribution pipeline, a distributor, a guide pipeline and an oil return pipeline. The inlet end of the distribution pipeline is connected to the switching valve, the inlet end of the distributor is connected to the outlet end of the distribution pipeline, the guide pipeline is arranged in a one-to-one correspondence with the gas-liquid separator and is respectively connected to one outlet end of the distributor, and the guide pipeline extends into the gas-liquid separator. The oil return pipeline is arranged in a one-to-one correspondence with the oil separator, the inlet end of the oil return pipeline is connected to the oil separator, and the outlet end is arranged between one outlet end of the distributor and the corresponding guide pipeline.

[0088] Fig. 9 The refrigeration cycle diagram of the air conditioning system is shown in Figure 2. Fig.10 The specific operation process of the air conditioning system is described in detail above and will not be repeated here.

[0089] The outdoor module also has a return pipeline. The return pipeline is arranged in a one-to-one correspondence with the gas-liquid separator. The return pipeline has a connecting pipe section, a connecting pipe section and a bent pipe section. The connecting pipe section is vertically arranged in the gas-liquid separator, the connecting pipe section is connected to the suction end of a compressor, the connecting pipe section is vertically arranged in the gas-liquid separator, and the bent pipe end connects the bottom of the connecting pipe section and the connecting pipe section. The sum of the heights of the connecting pipe section and the bent pipe section is less than the height of the gas-liquid separator.

[0090] In one or more embodiments of the present application, a connecting port is provided at the bottom of the curved pipe section, and the connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator.

[0091] In one or more embodiments of the present application, a bottom connecting port is provided at the bottom of the curved pipe section, and the bottom connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator.

[0092] In one or more embodiments of the present application, an upper connecting port is provided on the connecting pipe section, and the upper connecting port connects the reflux pipeline and the internal cavity of the gas-liquid separator.

[0093] In one or more embodiments of the present application, the liquid equalizing pipe is located above the upper connecting port.

[0094] In an air conditioning system having multiple outdoor modules, the first return pipe 115-1 has a first bottom connecting port 118-1 and a first upper connecting port 131-1, the second return pipe 115-2 has a second bottom connecting port 118-2 and a second upper connecting port 131-2, and the liquid balancing pipe 117 is located above the first upper connecting port 131-1 and the second upper connecting port 131-2. Take one of the outdoor modules as an example to illustrate, assuming that the liquid level of the liquid mixture of the first gas-liquid separator 114-1 is lower than the liquid level of the liquid mixture of the second gas-liquid separator 114-2. Since the liquid balancing pipe 117 is located above the first upper connecting port 131-1 and the second upper connecting port 131-2, the liquid mixture at the bottom of the first gas-liquid separator 114-1 will not be introduced into the second gas-liquid separator 114-2 through the liquid balancing pipe 117, thereby ensuring that the bottom connecting port of the first gas-liquid separator 114-1 returns oil normally.

[0095] For the second gas-liquid separator 114-2, if the liquid level of the liquid mixture in the second gas-liquid separator 114-2 rises and exceeds the second upper connecting port 131-2, the second bottom connecting port 118-2 and the second upper connecting port 131-2 simultaneously guide the flow of the liquid mixture, and the second bottom connecting port 118-2 and the second upper connecting port 131-2 simultaneously return oil and liquid, and the liquid mixture can be quickly sucked into the first compressor 101-1 connected thereto through the second return pipeline 115-2. When the oil pool of the first compressor 101-1 rises to a certain height, it will be discharged to the first oil separator 104-1 connected thereto. The first oil separator 104-1 returns the discharged oil to the first gas-liquid separator 114-1 through the first oil return pipeline 121, thereby raising the liquid level of the first gas-liquid separator 114-1, while the liquid level of the second gas-liquid separator 114-2 is lowered, and the liquid levels of the two gas-liquid separators tend to be consistent.

[0096] If the first outdoor module 11 lacks oil, the liquid levels of the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 in the first outdoor module 11 are lower than the liquid levels of the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 in the second outdoor module 12. The first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 in the second outdoor module 12 will simultaneously return oil and liquid to the compressor connected thereto through the bottom connecting port and the upper connecting port, thereby increasing the liquid level of the compressor oil pool. When it rises to a certain height, a large amount of oil will be discharged through the discharge end to the first oil separator 104-1 and the second oil separator connected thereto. The first oil separator 104-1 and the second oil separator have a certain separation efficiency, especially when a large amount of oil is discharged from the discharge end, the internal space of the first oil separator 104-1 and the second oil separator is sharply compressed, and the actual efficiency of the first oil separator 104-1 and the second oil separator drops sharply, and the actual separation efficiency may be less than 60%. At this time, a large amount of lubricating oil is discharged into the refrigerant cycle along with the high-speed refrigerant. A portion of the discharged lubricating oil will also enter the first outdoor module 11 and return to the first gas-liquid separator 114-1 and the second gas-liquid separator 114-2 in the first outdoor module 11, alleviating the oil shortage problem. Finally, the amount of lubricating oil in the first outdoor module 11 and the second outdoor module 12 tends to be consistent.

[0097] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0098] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. Air conditioning system, including: An outdoor module having: Multiple compressors; Switching valve; An oil separator, which is arranged one by one corresponding to the compressor, and each of the oil separators is connected to the discharge end of a compressor; and A gas-liquid separator, which is arranged in one-to-one correspondence with the compressor, the gas-liquid separator is respectively connected to the suction end of one compressor, and a gas equalizing pipe and a liquid equalizing pipe are arranged between the gas-liquid separators; Features: The outdoor module also has: a distribution pipeline, the inlet end of which is connected to the switching valve; a distributor, the inlet end of which is connected to the outlet end of the distribution pipeline; a flow guiding pipeline, which is arranged one by one with the gas-liquid separator and is respectively connected to one outlet end of the distributor, and the flow guiding pipeline extends into the gas-liquid separator; and The oil return pipeline is arranged in one-to-one correspondence with the oil separator, the inlet end of which is connected to the oil separator, and the outlet end is staggered between one outlet end of the distributor and the corresponding guide pipeline.

2. The air conditioning system according to claim 1, characterized in that: The outdoor module also has: A reflux pipeline is arranged in one-to-one correspondence with the gas-liquid separator, and the reflux pipeline has: A connecting pipe section, wherein the connecting pipe section is vertically arranged in the gas-liquid separator, and the connecting pipe section is connected to the suction end of one of the compressors; A connecting pipe section, wherein the connecting pipe section is vertically arranged in the gas-liquid separator; and A curved pipe section, the curved pipe section connecting the bottom of the connecting pipe section and the communicating pipe section; The sum of the heights of the connecting pipe section and the bent pipe section is less than the height of the gas-liquid separator.

3. The air conditioning system according to claim 2, characterized in that: A bottom connecting port is formed at the bottom of the curved pipe section, and the bottom connecting port is connected with the reflux pipeline and the inner cavity of the gas-liquid separator.

4. The air conditioning system according to any one of claims 1 to 3, characterized in that: The outdoor module also has: The regulating pipeline has an inlet end connected to a plurality of the oil separators and an outlet end connected to the distribution pipeline; the regulating pipeline is provided with a regulating capillary and a regulating solenoid valve.

5. The air conditioning system according to any one of claims 1 to 3, characterized in that: The oil return pipeline is provided with an oil return capillary and a filter.

6. Air conditioning system, including: Multiple outdoor modules, each with: Multiple compressors; Switching valve; An oil separator, which is arranged one by one corresponding to the compressor, and each of the oil separators is connected to the discharge end of a compressor; and A gas-liquid separator, which is arranged in one-to-one correspondence with the compressor, the gas-liquid separator is respectively connected to the suction end of one compressor, and a gas equalizing pipe and a liquid equalizing pipe are arranged between the gas-liquid separators; and Indoor module, which has: Indoor liquid side piping; Indoor gas side piping; Features: The outdoor module also has: Outdoor liquid side piping, the outdoor liquid side piping is connected to the indoor liquid side piping in multiple ways; Outdoor gas side piping, the outdoor gas side piping is connected to the indoor gas side piping in multiple ways; a distribution pipeline, the inlet end of which is connected to the switching valve; a distributor, the inlet end of which is connected to the outlet end of the distribution pipeline; a flow guiding pipeline, which is arranged one by one with the gas-liquid separator and is respectively connected to one outlet end of the distributor, and the flow guiding pipeline extends into the gas-liquid separator; and The oil return pipeline is arranged in one-to-one correspondence with the oil separator, the inlet end of which is connected to the oil separator, and the outlet end is staggered between one outlet end of the distributor and the corresponding guide pipeline.

7. The air conditioning system according to claim 6, characterized in that: The outdoor module also has: A reflux pipeline is arranged in one-to-one correspondence with the gas-liquid separator, and the reflux pipeline has: A connecting pipe section, wherein the connecting pipe section is vertically arranged in the gas-liquid separator, and the connecting pipe section is connected to the suction end of one of the compressors; A connecting pipe section, wherein the connecting pipe section is vertically arranged in the gas-liquid separator; and A curved pipe section, the curved pipe section connecting the bottom of the connecting pipe section and the communicating pipe section; The sum of the heights of the connecting pipe section and the bent pipe section is less than the height of the gas-liquid separator.

8. The air conditioning system according to claim 7, characterized in that: A communication port is provided at the bottom of the curved pipe section, and the communication port is connected with the reflux pipeline and the inner cavity of the gas-liquid separator.

9. The air conditioning system according to claim 7, characterized in that: A bottom connecting port is formed at the bottom of the curved pipe section, and the bottom connecting port is connected with the reflux pipeline and the inner cavity of the gas-liquid separator; An upper communication port is provided on the connecting pipe section, and the upper communication port is connected with the reflux pipeline and the inner cavity of the gas-liquid separator.

10. The air conditioning system according to claim 9, characterized in that: The liquid balancing pipe is located above the upper communication port.

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